Stock Options (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Number of Options
Options outstanding - beginning balance	545,000	385,000	385,000
Options granted		310,000	310,000
Options exercised	(187,500)	(150,000)	(150,000)
Options oustanding - ending balance	357,500		545,000
Options exercisable	347,500
Weighted average exercise price
Options outstanding - beginning balance	$ 3.09	$ 1.42	$ 1.42
Options granted			4.20
Options exercised	2.86		1.12
Options outstanding - ending balance	3.21		$ 3.09
Options exercisable	$ 3.27
Weighted average remaining contracted term
Options outstanding - ending balance	8 years 29 days
Options exercisable	8 years 1 month 20 days
Aggregate intrinsic value
Options outstanding - ending balance	$ 311,525
Options exercisable	$ 283,525